An Australian fighter jet is readied for a training mission at the Cope North military exercises at Andersen Air Force Base on the U.S. island of Guam, Thursday, Feb. 7, 2013. Fighter jets from the U.S. and two key allies roared into Western Pacific skies Thursday in the combat phase of exercises that have gained importance as the region responds to the rise of China and other potential threats. (AP Photo/Eric Talmadge)

Photo by: Eric Talmadge

An Australian fighter jet is readied for a training mission at the Cope North military exercises at Andersen Air Force Base on the U.S. island of Guam, Thursday, Feb. 7, 2013. Fighter jets from the U.S. and two key allies roared into Western Pacific skies Thursday in the combat phase of exercises that have gained importance as the region responds to the rise of China and other potential threats. (AP Photo/Eric Talmadge)